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유전체 충전형 플라즈마 반응기를 이용한 Trichloroethylene의 분해반응
이해완,류삼곤,박명규,박현배,황경창 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.3
유전체 충전형 플라즈마 반응기를 이용하여 공기중 trichloroethylene (TCE)의 분해반응에 대한 연구를 수행하였다. 방전전력, 체류시간 및 반응물 유입농도 등과 같은 여러 가지 운전변수에 따른 TCE의분해효율을 조사하고, 반응 부산물의 분석을 통하여 TCE 분해 반응 메커니즘을 제시하였다. 실험결과 방전전력 및 체류시간이 증가함에 따라 TCE 분해효율은 증가하였으나 유입농도의 변화에 대한 영향은 거의 없었다. BaTiO_3를 충전한 반응기가 알루미나를 충전한 반응기보다 분해효율이 높았으나 TCE의 완전 산화분해의척도가 되는 CO_x(CO+CO_2)의 수율 및 CO_2의 선택도는 BaTiO_3를 충전한 반응기보다 알루미나를 충전한 반응기가 월등하게 높았다. 반응생성물 분석결과 주반응 생성물은 CO_x,CHCl_2COCl, C_2H_2Cl_2O_2및 COCl_2로 공기중 TCE의 분해 메커니즘은 주로 ClO와 OH 라디칼에 의한 반응으로 판단된다. The decompositon of trichloroethylene (TCE) in air using a ferroelectric packed-bed reactor was studied. The effects of discharge power, residence time, inlet concentration and other operating conditions on the decomposition efficiency were investigated and the analysis of reaction products was conducted to suggest the mechanism of TCE decomposition. Experimental results showed that the decomposition efficiency of TCE increased with increasing discharge power and residence time but was unaffected by inlet concentration. The decomposition efficiency for BaTiO_3 packed reactor was higher than that for alumina packed reactor, but the yield of CO_x(CO+CO_2) and selectivity of CO_2 as the measure of the complete oxidation of TCE were higher in alumina packed reactor. The main products of TCE decomposition were CO_x,CHCl_2COCl, C_2H_2Cl_2O_2 and COCl_2. On the basis of the results, it is inferred that the decomposition of TCE in air proceeds by OH and CIO radical reaction mechanism.
Availability of Zr-Based MOFs for the degradation of nerve agents in all humidity conditions
Ryu, Sam Gon,Kim, Min-Kun,Park, Myungkyu,Jang, Seong On,Kim, Sung Hun,Jung, Hyunsook Elsevier 2019 Microporous and mesoporous materials Vol.274 No.-
<P><B>Abstract</B></P> <P>Organophosphate-based nerve agents are among the most toxic chemical compounds known to mankind. In this report, we studied the degradation of soman (GD) and VX, two of the major nerve agents, by Zr(OH)<SUB>4</SUB> and Zr-based Metal-Organic Frameworks (MOFs) such as MOF-808, UiO-66 and UiO-66-NH<SUB>2</SUB> in the neat condition and in non-buffered aqueous solution at room temperature. Unlike Zr(OH)<SUB>4</SUB>, relatively less hydrophilic Zr-based MOFs were found to maintain excellent nerve agent decomposition ability, even under high relative humidity and in water. This study's results demonstrated that these Zr-based MOFs are all-weather materials that can be used to decompose nerve agents in all humidity conditions and even in water. The enhancement effect by the amine group of UiO-66-NH<SUB>2</SUB> was not observed for decomposition of nerve agents in the present study, unlike the results obtained in alkaline buffered solution, which were reported previously. It was also demonstrated that MOF-808 with a pore size larger than the UiO-66 series had a better ability to degrade nerve agents.</P> <P><B>Highlights</B></P> <P> <UL> <LI> In the case of Zr(OH)<SUB>4</SUB>, the degradation ability for GD and VX in the high humidity condition and water was remarkably decreased. </LI> <LI> Zr-based MOFs were found to maintain the ability to degrade nerve agents in all atmospheric humidity conditions and even in water. </LI> <LI> This difference in decomposition abilities is presumed to be due to the differences in the hydrophilicity between Zr(OH)<SUB>4</SUB> and Zr-based MOFs. </LI> <LI> There was no significant difference in the degradability between UiO-66 and UiO-66-NH<SUB>2</SUB> for nerve agents in real field conditions. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
충전형 저온 플라즈마 반응기에서 시안 화합물의 분해 특성
류삼곤 ( Sam Gon Ryu ),박명규 ( Myung Kyu Park ),이해완 ( Hae Wan Lee ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.2
The decomposition behaviors of gaseous cyanides in non-thermal plasma-catalyst hybrid reactor have been investigated with the variation of discharge power, influent concentration of cyanide, humidity of air carrier and packed materials in the reactor. Destruction of cyanides by plasma only process was very difficult compared to that of trichloroethylene. But the destruction efficiencies of cyanides were dramatically improved through packing alumina or Pt/alumina bead in the plasma discharge region. From the results, it could be assumed that thermal catalytic effect is involved simultaneously with plasma in the reaction of cyanides destruction on the alumina or Pt/alumina packed plasma reactor.
이정삼 ( Jung-sam Lee ),류정곤 ( Jeong-gon Ryu ),기해경 ( Hae-kyung Kee ) 한국수산경영학회 2017 수산경영론집 Vol.48 No.3
This study is aimed to analyze the change of chinese fishing vessels` entry into the East Sea off North Korea and suggest directions for countermeasures. Based on the real landing data in China, Chinese fishing vessels` squid catch volume and value in the East Sea off North Korea are estimated. Results show that at least 205 thousand tons of squid was caught by Chinese fishing vessels in 2014. If the catch amount is calculated by the unit price per kilogram at the same year in Korea, it would be 556.3 billion KRW. As the UN sanctions become stricter with the recent resolution 2371 passed, Chinese fishing vessels` entry may increase in the future to compensate decreased seafood supply from North Korea. Even though there are not many options left for Korea to decrease the impact of Chinese depletive fishing, the study suggests countermeasures such as strengthening cooperative crack down on the Chinese illegal fishing vessels in Korean waters; increasing cooperation with UN member countries to incorporate banning the trade of fishing rights in the next UN sanctions; establishing regional fisheries management organization and managing migratory species with China and Japan cooperatively in the long term.
Preparation and Characterization of Chromium Oxide Supported on Zirconia
배영일,Sohn, Jong Rack,Ryu, Sam Gon,Park, Man Young,Pae, Yeong Il 대한화학회 1992 Bulletin of the Korean Chemical Society Vol.13 No.6
Chromium oxide/zirconia catalysts were prepared by dry impregnation of powdered $Zr(OH)_4$ with ($NH_4$)$_2$CrO$_4$aqueous solution. The characterization of prepared catalysts was performed using FTIR, XPS, XRD and DTA methods, and by the measurement of surface area. The addition of chromium oxide to zirconia shifted the transitions of $ZrO_2$ from amorphous to tetragonal phase and from tetragonal to monoclinic phase to higher temperature due to the strong interaction between chromium oxide and zirconia, and the specific surface area of catalysts increased in proportion to the chromium oxide content. Since the $ZrO_2$ stabilizes supported chromium oxide, chromium oxide was well dispersed on the surface of zirconia, and ${\alpha}$-$Cr_2O_3$ was observed only at the calcination temperature above 1173 K. Upon the addition of only small amount of chromium oxide (1 wt% Cr) to $ZrO_2$, both the acidity and acid strength of catalyst increased remarkably, showing the presence of two kinds of acid sites on the surface of $CrO_x$/$ZrO_4$-Bronsted and Lewis.
Acidic and Catalytic Properties of Modified Silica Catalyst with Benzenesulfo Groups
Sohn, Jong-Rack,Ryu, Sam-Gon,Pae, Young-Il,Choi, Sang-June Korean Chemical Society 1990 Bulletin of the Korean Chemical Society Vol.11 No.5
Two types of new silica catalysts modified with benzenesulfonic acid derivatives were prepared by esterification or phenylation followed by sulfonation. Both catalysts thus prepared were tested as acid catalysts for 2-propanol dehydration and cumene dealkylation reactions. B catalyst () were more active than A catalyst (). Highter catalytic activity for B catalyst may be accounted for by higher resistance to water, higher acid strength, more acidity, and better thermal stability as compared with A catalyst.